From: Sameer Pujar <spujar@nvidia.com>
To: perex@perex.cz, tiwai@suse.com, broonie@kernel.org
Cc: alsa-devel@alsa-project.org, Sameer Pujar <spujar@nvidia.com>
Subject: [PATCH 3/5] ALSA: hda: add register offset for stripe control
Date: Thu, 10 Jan 2019 22:33:23 +0530 [thread overview]
Message-ID: <1547139805-1904-3-git-send-email-spujar@nvidia.com> (raw)
In-Reply-To: <1547139805-1904-1-git-send-email-spujar@nvidia.com>
bits 16:17 in SD_CTL register refer to stripe control. Added an
offset register(AZX_REG_SD_CTL_3B) to have exclusive read/write
of corresponding register byte. This helps to avoid unnecessary
32-bit read/write of SD_CTL whenever only stripe or other bits of
corresponding byte need to be updated. Also HD audio spec defines
SD_CTL as 3 byte register.
Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Reviewed-by: Mohan Kumar D <mkumard@nvidia.com>
Reviewed-by: Ravindra Lokhande <rlokhande@nvidia.com>
---
include/sound/hda_register.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/include/sound/hda_register.h b/include/sound/hda_register.h
index 2ab39fb..5b1f5d8 100644
--- a/include/sound/hda_register.h
+++ b/include/sound/hda_register.h
@@ -79,6 +79,7 @@ enum { SDI0, SDI1, SDI2, SDI3, SDO0, SDO1, SDO2, SDO3 };
/* stream register offsets from stream base */
#define AZX_REG_SD_CTL 0x00
+#define AZX_REG_SD_CTL_3B 0x02 /* 3rd byte of SD_CTL register */
#define AZX_REG_SD_STS 0x03
#define AZX_REG_SD_LPIB 0x04
#define AZX_REG_SD_CBL 0x08
--
2.7.4
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next prev parent reply other threads:[~2019-01-10 17:03 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-10 17:03 [PATCH 1/5] ALSA: hda: add verbs for stripe control Sameer Pujar
2019-01-10 17:03 ` [PATCH 2/5] ALSA: hda: Add api to program stripe control bits Sameer Pujar
2019-01-10 17:03 ` Sameer Pujar [this message]
2019-01-10 17:03 ` [PATCH 4/5] ALSA: hda: program stripe bits for controller Sameer Pujar
2019-01-11 11:20 ` Takashi Iwai
2019-01-10 17:03 ` [PATCH 5/5] ALSA: hda: program stripe control for codec Sameer Pujar
2019-01-11 11:21 ` Takashi Iwai
2019-01-11 11:22 ` [PATCH 1/5] ALSA: hda: add verbs for stripe control Takashi Iwai
2019-01-11 11:30 ` Sameer Pujar
2019-01-11 11:47 ` Takashi Iwai
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